1813957169 has 4 divisors (see below), whose sum is σ = 1892824896. Its totient is φ = 1735089444.

The previous prime is 1813957147. The next prime is 1813957177. The reversal of 1813957169 is 9617593181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1813957169 - 2¹² = 1813953073 is a prime.

It is a super-2 number, since 2×1813957169² = 6580881221932989122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1813950169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39433829 + ... + 39433874.

It is an arithmetic number, because the mean of its divisors is an integer number (473206224).

Almost surely, 2^1813957169 is an apocalyptic number.

It is an amenable number.

1813957169 is a deficient number, since it is larger than the sum of its proper divisors (78867727).

1813957169 is an equidigital number, since it uses as much as digits as its factorization.

1813957169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78867726.

The product of its digits is 408240, while the sum is 50.

The square root of 1813957169 is about 42590.5760585602. The cubic root of 1813957169 is about 1219.5763935135.

The spelling of 1813957169 in words is "one billion, eight hundred thirteen million, nine hundred fifty-seven thousand, one hundred sixty-nine".